Police believe a camper may have accidentally lit a fire at Gemmills Swamp in Mooroopna on Friday last week.

Police believe a camper may have accidentally lit a fire in a Mooroopna national park.

Firefighters were called to Gemmills Swamp about 4.40pm on Friday after receiving reports a fire was burning along the banks of the Goulburn River.

Department of Environment and Primary Industries spokesman Darren Skelton said eight firefighters from its Nathalia crew initially responded and were joined by an additional seven firefighters as well as tankers from the Country Fire Authority.

Mr Skelton said the fire, which burned through 0.1ha of bushland, was contained about 5.30pm and controlled by about 6.50pm.

He said crews continued to black out the fire ground until about 10pm and would regularly patrol the area.

Shepparton police Crime Investigation Unit Senior Constable Chris Morrison said it appeared a camper might have accidentally lit the fire and left the scene.

Sen Const Morrison said police would continue to make inquiries and urged any witnesses to contact police.

Anyone with information can phone Shepparton police on 58205777 or Crime Stoppers on 1800333000.